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Pensions and Post-Employment Benefits - Sensitivity Analysis of Pension and Other Post-Employment Benefits (Detail) $ in Millions	Dec. 31, 2017 MXN ($)
Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	$ (4,100)
Sensitivity, possible decrease in actuarial assumption	4,509
Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	189
Sensitivity, possible decrease in actuarial assumption	(166)
Actuarial assumption of expected rates of pension increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	2,341
Sensitivity, possible decrease in actuarial assumption	(2,209)
Pensions [Member] | Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	(4,028)
Sensitivity, possible decrease in actuarial assumption	4,426
Pensions [Member] | Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	154
Sensitivity, possible decrease in actuarial assumption	(138)
Pensions [Member] | Actuarial assumption of expected rates of pension increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	2,341
Sensitivity, possible decrease in actuarial assumption	(2,209)
Other post employment benefits [Member] | Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	(72)
Sensitivity, possible decrease in actuarial assumption	83
Other post employment benefits [Member] | Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	34
Sensitivity, possible decrease in actuarial assumption	(29)
Other post employment benefits [Member] | Actuarial assumption of expected rates of pension increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	0
Sensitivity, possible decrease in actuarial assumption	$ 0

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- Definition

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+ References

No definition available.

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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